X+(2+x)=21

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Solution for X+(2+x)=21 equation:


Simplifying
X + (2 + x) = 21

Remove parenthesis around (2 + x)
X + 2 + x = 21

Reorder the terms:
2 + X + x = 21

Solving
2 + X + x = 21

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + X + -2 + x = 21 + -2

Reorder the terms:
2 + -2 + X + x = 21 + -2

Combine like terms: 2 + -2 = 0
0 + X + x = 21 + -2
X + x = 21 + -2

Combine like terms: 21 + -2 = 19
X + x = 19

Add '-1x' to each side of the equation.
X + x + -1x = 19 + -1x

Combine like terms: x + -1x = 0
X + 0 = 19 + -1x
X = 19 + -1x

Simplifying
X = 19 + -1x

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